Journal article

A simulation study of the shape of beta ' precipitates in Mg-Y and Mg-Gd alloys

H Liu, Y Gao, JZ Liu, YM Zhu, Y Wang, JF Nie

Acta Materialia | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2013

Abstract

The metastable β′ phase is a key strengthening precipitate phase in a range of Mg-RE (RE: rare-earth elements) based alloys. The morphology of the β′ precipitates changes from a faceted and nearly equiaxed shape in Mg-Y alloys to a truncated lenticular shape in Mg-Gd alloys. In this work, we study effects of interfacial energy and coherency elastic strain energy on the morphology of β′ precipitates in binary Mg-Y and Mg-Gd alloys using a combination of first-principles calculations and phase-field simulations. Without any free-fitting parameters and using the first-principles calculations, CALPHAD databases and experimental characterizations as model inputs (lattice parameters of the β′ phas..

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University of Melbourne Researchers

Grants

Awarded by US Department of Energy, Office of Basic Energy Sciences


Awarded by National Science Foundation


Funding Acknowledgements

H.L. and Y.M.Z. are grateful to the financial support from the Australian Research Council (ARC). Y.W. and J.F.N. acknowledge the ARC Discovery Project grant. H.L. also wishes to acknowledge the support from Monash University in the form of Monash Graduate Scholarship and International Postgraduate Research Scholarship. Y.G. and Y.W. acknowledge the financial support from US Department of Energy, Office of Basic Energy Sciences under grant DE-SC0001258 and the National Science Foundation under Grants DMR1008349. Y.W. also acknowledges the support from the Air Force Office of Scientific Research and the ARC International Fellowship. J.Z.L. acknowledges the support from the NCI National Facility at ANU under the Merit Allocation Scheme.